/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.support.v4.app;

import android.app.Activity;
import android.content.ComponentCallbacks;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.util.DebugUtils;
import android.support.v4.view.Menu;
import android.support.v4.view.MenuItem;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
import android.view.animation.Animation;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.HashMap;

final class FragmentState implements Parcelable {
	final String mClassName;
	final int mIndex;
	final boolean mFromLayout;
	final int mFragmentId;
	final int mContainerId;
	final String mTag;
	final boolean mRetainInstance;
	final boolean mDetached;
	final Bundle mArguments;

	Bundle mSavedFragmentState;

	Fragment mInstance;

	public FragmentState(Fragment frag) {
		mClassName = frag.getClass().getName();
		mIndex = frag.mIndex;
		mFromLayout = frag.mFromLayout;
		mFragmentId = frag.mFragmentId;
		mContainerId = frag.mContainerId;
		mTag = frag.mTag;
		mRetainInstance = frag.mRetainInstance;
		mDetached = frag.mDetached;
		mArguments = frag.mArguments;
	}

	public FragmentState(Parcel in) {
		mClassName = in.readString();
		mIndex = in.readInt();
		mFromLayout = in.readInt() != 0;
		mFragmentId = in.readInt();
		mContainerId = in.readInt();
		mTag = in.readString();
		mRetainInstance = in.readInt() != 0;
		mDetached = in.readInt() != 0;
		mArguments = in.readBundle();
		mSavedFragmentState = in.readBundle();
	}

	public Fragment instantiate(SupportActivity activity) {
		if (mInstance != null) {
			return mInstance;
		}

		if (mArguments != null) {
			mArguments.setClassLoader(activity.getClassLoader());
		}

		mInstance = Fragment.instantiate(activity.asActivity(), mClassName, mArguments);

		if (mSavedFragmentState != null) {
			mSavedFragmentState.setClassLoader(activity.getClassLoader());
			mInstance.mSavedFragmentState = mSavedFragmentState;
		}
		mInstance.setIndex(mIndex);
		mInstance.mFromLayout = mFromLayout;
		mInstance.mRestored = true;
		mInstance.mFragmentId = mFragmentId;
		mInstance.mContainerId = mContainerId;
		mInstance.mTag = mTag;
		mInstance.mRetainInstance = mRetainInstance;
		mInstance.mDetached = mDetached;
		mInstance.mFragmentManager = activity.getInternalCallbacks().getFragments();

		return mInstance;
	}

	public int describeContents() {
		return 0;
	}

	public void writeToParcel(Parcel dest, int flags) {
		dest.writeString(mClassName);
		dest.writeInt(mIndex);
		dest.writeInt(mFromLayout ? 1 : 0);
		dest.writeInt(mFragmentId);
		dest.writeInt(mContainerId);
		dest.writeString(mTag);
		dest.writeInt(mRetainInstance ? 1 : 0);
		dest.writeInt(mDetached ? 1 : 0);
		dest.writeBundle(mArguments);
		dest.writeBundle(mSavedFragmentState);
	}

	public static final Parcelable.Creator<FragmentState> CREATOR = new Parcelable.Creator<FragmentState>() {
		public FragmentState createFromParcel(Parcel in) {
			return new FragmentState(in);
		}

		public FragmentState[] newArray(int size) {
			return new FragmentState[size];
		}
	};
}

/**
 * Static library support version of the framework's
 * {@link android.app.Fragment}. Used to write apps that run on platforms prior
 * to Android 3.0. When running on Android 3.0 or above, this implementation is
 * still used; it does not try to switch to the framework's implementation. See
 * the framework SDK documentation for a class overview.
 */
public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener {
	private static final HashMap<String, Class<?>> sClassMap = new HashMap<String, Class<?>>();

	static final int INITIALIZING = 0; // Not yet created.
	static final int CREATED = 1; // Created.
	static final int ACTIVITY_CREATED = 2; // The activity has finished its
											// creation.
	static final int STOPPED = 3; // Fully created, not started.
	static final int STARTED = 4; // Created and started, not resumed.
	static final int RESUMED = 5; // Created started and resumed.

	int mState = INITIALIZING;

	// Non-null if the fragment's view hierarchy is currently animating away,
	// meaning we need to wait a bit on completely destroying it. This is the
	// view that is animating.
	View mAnimatingAway;

	// If mAnimatingAway != null, this is the state we should move to once the
	// animation is done.
	int mStateAfterAnimating;

	// When instantiated from saved state, this is the saved state.
	Bundle mSavedFragmentState;
	SparseArray<Parcelable> mSavedViewState;

	// Index into active fragment array.
	int mIndex = -1;

	// Internal unique name for this fragment;
	String mWho;

	// Construction arguments;
	Bundle mArguments;

	// Target fragment.
	Fragment mTarget;

	// For use when retaining a fragment: this is the index of the last mTarget.
	int mTargetIndex = -1;

	// Target request code.
	int mTargetRequestCode;

	// True if the fragment is in the list of added fragments.
	boolean mAdded;

	// If set this fragment is being removed from its activity.
	boolean mRemoving;

	// True if the fragment is in the resumed state.
	boolean mResumed;

	// Set to true if this fragment was instantiated from a layout file.
	boolean mFromLayout;

	// Set to true when the view has actually been inflated in its layout.
	boolean mInLayout;

	// True if this fragment has been restored from previously saved state.
	boolean mRestored;

	// Number of active back stack entries this fragment is in.
	int mBackStackNesting;

	// The fragment manager we are associated with. Set as soon as the
	// fragment is used in a transaction; cleared after it has been removed
	// from all transactions.
	FragmentManagerImpl mFragmentManager;

	// Activity this fragment is attached to.
	SupportActivity mActivity;

	// The optional identifier for this fragment -- either the container ID if
	// it
	// was dynamically added to the view hierarchy, or the ID supplied in
	// layout.
	int mFragmentId;

	// When a fragment is being dynamically added to the view hierarchy, this
	// is the identifier of the parent container it is being added to.
	int mContainerId;

	// The optional named tag for this fragment -- usually used to find
	// fragments that are not part of the layout.
	String mTag;

	// Set to true when the app has requested that this fragment be hidden
	// from the user.
	boolean mHidden;

	// Set to true when the app has requested that this fragment be deactivated.
	boolean mDetached;

	// If set this fragment would like its instance retained across
	// configuration changes.
	boolean mRetainInstance;

	// If set this fragment is being retained across the current config change.
	boolean mRetaining;

	// If set this fragment has menu items to contribute.
	boolean mHasMenu;

	// Set to true to allow the fragment's menu to be shown.
	boolean mMenuVisible = true;

	// Used to verify that subclasses call through to super class.
	boolean mCalled;

	// If app has requested a specific animation, this is the one to use.
	int mNextAnim;

	// The parent container of the fragment after dynamically added to UI.
	ViewGroup mContainer;

	// The View generated for this fragment.
	View mView;

	// The real inner view that will save/restore state.
	View mInnerView;

	// Whether this fragment should defer starting until after other fragments
	// have been started and their loaders are finished.
	boolean mDeferStart;

	// Hint provided by the app that this fragment is currently visible to the
	// user.
	boolean mUserVisibleHint = true;

	LoaderManagerImpl mLoaderManager;
	boolean mLoadersStarted;
	boolean mCheckedForLoaderManager;

	/**
	 * State information that has been retrieved from a fragment instance
	 * through {@link FragmentManager#saveFragmentInstanceState(Fragment)
	 * FragmentManager.saveFragmentInstanceState}.
	 */
	public static class SavedState implements Parcelable {
		final Bundle mState;

		SavedState(Bundle state) {
			mState = state;
		}

		SavedState(Parcel in, ClassLoader loader) {
			mState = in.readBundle();
			if (loader != null && mState != null) {
				mState.setClassLoader(loader);
			}
		}

		@Override
		public int describeContents() {
			return 0;
		}

		@Override
		public void writeToParcel(Parcel dest, int flags) {
			dest.writeBundle(mState);
		}

		public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
			public SavedState createFromParcel(Parcel in) {
				return new SavedState(in, null);
			}

			public SavedState[] newArray(int size) {
				return new SavedState[size];
			}
		};
	}

	/**
	 * Thrown by {@link Fragment#instantiate(Context, String, Bundle)} when
	 * there is an instantiation failure.
	 */
	static public class InstantiationException extends RuntimeException {
		private static final long serialVersionUID = 8423238441973733190L;

		public InstantiationException(String msg, Exception cause) {
			super(msg, cause);
		}
	}

	/**
	 * Default constructor. <strong>Every</strong> fragment must have an empty
	 * constructor, so it can be instantiated when restoring its activity's
	 * state. It is strongly recommended that subclasses do not have other
	 * constructors with parameters, since these constructors will not be called
	 * when the fragment is re-instantiated; instead, arguments can be supplied
	 * by the caller with {@link #setArguments} and later retrieved by the
	 * Fragment with {@link #getArguments}.
	 * 
	 * <p>
	 * Applications should generally not implement a constructor. The first
	 * place application code an run where the fragment is ready to be used is
	 * in {@link #onAttach(Activity)}, the point where the fragment is actually
	 * associated with its activity. Some applications may also want to
	 * implement {@link #onInflate} to retrieve attributes from a layout
	 * resource, though should take care here because this happens for the
	 * fragment is attached to its activity.
	 */
	public Fragment() {
	}

	/**
	 * Like {@link #instantiate(Context, String, Bundle)} but with a null
	 * argument Bundle.
	 */
	public static Fragment instantiate(Context context, String fname) {
		return instantiate(context, fname, null);
	}

	/**
	 * Create a new instance of a Fragment with the given class name. This is
	 * the same as calling its empty constructor.
	 * 
	 * @param context
	 *            The calling context being used to instantiate the fragment.
	 *            This is currently just used to get its ClassLoader.
	 * @param fname
	 *            The class name of the fragment to instantiate.
	 * @param args
	 *            Bundle of arguments to supply to the fragment, which it can
	 *            retrieve with {@link #getArguments()}. May be null.
	 * @return Returns a new fragment instance.
	 * @throws InstantiationException
	 *             If there is a failure in instantiating the given fragment
	 *             class. This is a runtime exception; it is not normally
	 *             expected to happen.
	 */
	public static Fragment instantiate(Context context, String fname, Bundle args) {
		try {
			Class<?> clazz = sClassMap.get(fname);
			if (clazz == null) {
				// Class not found in the cache, see if it's real, and try to
				// add it
				clazz = context.getClassLoader().loadClass(fname);
				sClassMap.put(fname, clazz);
			}
			Fragment f = (Fragment) clazz.newInstance();
			if (args != null) {
				args.setClassLoader(f.getClass().getClassLoader());
				f.mArguments = args;
			}
			return f;
		} catch (ClassNotFoundException e) {
			throw new InstantiationException("Unable to instantiate fragment " + fname + ": make sure class name exists, is public, and has an"
					+ " empty constructor that is public", e);
		} catch (java.lang.InstantiationException e) {
			throw new InstantiationException("Unable to instantiate fragment " + fname + ": make sure class name exists, is public, and has an"
					+ " empty constructor that is public", e);
		} catch (IllegalAccessException e) {
			throw new InstantiationException("Unable to instantiate fragment " + fname + ": make sure class name exists, is public, and has an"
					+ " empty constructor that is public", e);
		}
	}

	final void restoreViewState() {
		if (mSavedViewState != null) {
			mInnerView.restoreHierarchyState(mSavedViewState);
			mSavedViewState = null;
		}
	}

	final void setIndex(int index) {
		mIndex = index;
		mWho = "android:fragment:" + mIndex;
	}

	final boolean isInBackStack() {
		return mBackStackNesting > 0;
	}

	/**
	 * Subclasses can not override equals().
	 */
	@Override
	final public boolean equals(Object o) {
		return super.equals(o);
	}

	/**
	 * Subclasses can not override hashCode().
	 */
	@Override
	final public int hashCode() {
		return super.hashCode();
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder(128);
		DebugUtils.buildShortClassTag(this, sb);
		if (mIndex >= 0) {
			sb.append(" #");
			sb.append(mIndex);
		}
		if (mFragmentId != 0) {
			sb.append(" id=0x");
			sb.append(Integer.toHexString(mFragmentId));
		}
		if (mTag != null) {
			sb.append(" ");
			sb.append(mTag);
		}
		sb.append('}');
		return sb.toString();
	}

	/**
	 * Return the identifier this fragment is known by. This is either the
	 * android:id value supplied in a layout or the container view ID supplied
	 * when adding the fragment.
	 */
	final public int getId() {
		return mFragmentId;
	}

	/**
	 * Get the tag name of the fragment, if specified.
	 */
	final public String getTag() {
		return mTag;
	}

	/**
	 * Supply the construction arguments for this fragment. This can only be
	 * called before the fragment has been attached to its activity; that is,
	 * you should call it immediately after constructing the fragment. The
	 * arguments supplied here will be retained across fragment destroy and
	 * creation.
	 */
	public void setArguments(Bundle args) {
		if (mIndex >= 0) {
			throw new IllegalStateException("Fragment already active");
		}
		mArguments = args;
	}

	/**
	 * Return the arguments supplied when the fragment was instantiated, if any.
	 */
	final public Bundle getArguments() {
		return mArguments;
	}

	/**
	 * Set the initial saved state that this Fragment should restore itself from
	 * when first being constructed, as returned by
	 * {@link FragmentManager#saveFragmentInstanceState(Fragment)
	 * FragmentManager.saveFragmentInstanceState}.
	 * 
	 * @param state
	 *            The state the fragment should be restored from.
	 */
	public void setInitialSavedState(SavedState state) {
		if (mIndex >= 0) {
			throw new IllegalStateException("Fragment already active");
		}
		mSavedFragmentState = state != null && state.mState != null ? state.mState : null;
	}

	/**
	 * Optional target for this fragment. This may be used, for example, if this
	 * fragment is being started by another, and when done wants to give a
	 * result back to the first. The target set here is retained across
	 * instances via {@link FragmentManager#putFragment
	 * FragmentManager.putFragment()}.
	 * 
	 * @param fragment
	 *            The fragment that is the target of this one.
	 * @param requestCode
	 *            Optional request code, for convenience if you are going to
	 *            call back with {@link #onActivityResult(int, int, Intent)}.
	 */
	public void setTargetFragment(Fragment fragment, int requestCode) {
		mTarget = fragment;
		mTargetRequestCode = requestCode;
	}

	/**
	 * Return the target fragment set by {@link #setTargetFragment}.
	 */
	final public Fragment getTargetFragment() {
		return mTarget;
	}

	/**
	 * Return the target request code set by {@link #setTargetFragment}.
	 */
	final public int getTargetRequestCode() {
		return mTargetRequestCode;
	}

	/**
	 * Return the Activity this fragment is currently associated with.
	 * 
	 * @see #getSupportActivity()
	 */
	final public Activity getActivity() {
		return (mActivity != null) ? mActivity.asActivity() : null;
	}

	/**
	 * Return the SupportActivity interface for the activity in which this
	 * fragment is currently associated.
	 * 
	 * @see #getActivity()
	 */
	final public SupportActivity getSupportActivity() {
		return mActivity;
	}

	/**
	 * Return <code>getActivity().getResources()</code>.
	 */
	final public Resources getResources() {
		if (mActivity == null) {
			throw new IllegalStateException("Fragment " + this + " not attached to Activity");
		}
		return mActivity.getResources();
	}

	/**
	 * Return a localized, styled CharSequence from the application's package's
	 * default string table.
	 * 
	 * @param resId
	 *            Resource id for the CharSequence text
	 */
	public final CharSequence getText(int resId) {
		return getResources().getText(resId);
	}

	/**
	 * Return a localized string from the application's package's default string
	 * table.
	 * 
	 * @param resId
	 *            Resource id for the string
	 */
	public final String getString(int resId) {
		return getResources().getString(resId);
	}

	/**
	 * Return a localized formatted string from the application's package's
	 * default string table, substituting the format arguments as defined in
	 * {@link java.util.Formatter} and {@link java.lang.String#format}.
	 * 
	 * @param resId
	 *            Resource id for the format string
	 * @param formatArgs
	 *            The format arguments that will be used for substitution.
	 */

	public final String getString(int resId, Object... formatArgs) {
		return getResources().getString(resId, formatArgs);
	}

	/**
	 * Return the FragmentManager for interacting with fragments associated with
	 * this fragment's activity. Note that this will be non-null slightly before
	 * {@link #getActivity()}, during the time from when the fragment is placed
	 * in a {@link FragmentTransaction} until it is committed and attached to
	 * its activity.
	 */
	final public FragmentManager getFragmentManager() {
		return mFragmentManager;
	}

	/**
	 * A clone of {@link #getFragmentManager()} to maintain naming conventions
	 * throughout the compatibility library.
	 */
	final public FragmentManager getSupportFragmentManager() {
		return mFragmentManager;
	}

	/**
	 * Return true if the fragment is currently added to its activity.
	 */
	final public boolean isAdded() {
		return mActivity != null && mAdded;
	}

	/**
	 * Return true if the fragment has been explicitly detached from the UI.
	 * That is, {@link FragmentTransaction#detach(Fragment)
	 * FragmentTransaction.detach(Fragment)} has been used on it.
	 */
	final public boolean isDetached() {
		return mDetached;
	}

	/**
	 * Return true if this fragment is currently being removed from its
	 * activity. This is <em>not</em> whether its activity is finishing, but
	 * rather whether it is in the process of being removed from its activity.
	 */
	final public boolean isRemoving() {
		return mRemoving;
	}

	/**
	 * Return true if the layout is included as part of an activity view
	 * hierarchy via the &lt;fragment&gt; tag. This will always be true when
	 * fragments are created through the &lt;fragment&gt; tag, <em>except</em>
	 * in the case where an old fragment is restored from a previous state and
	 * it does not appear in the layout of the current state.
	 */
	final public boolean isInLayout() {
		return mInLayout;
	}

	/**
	 * Return true if the fragment is in the resumed state. This is true for the
	 * duration of {@link #onResume()} and {@link #onPause()} as well.
	 */
	final public boolean isResumed() {
		return mResumed;
	}

	/**
	 * Return true if the fragment is currently visible to the user. This means
	 * it: (1) has been added, (2) has its view attached to the window, and (3)
	 * is not hidden.
	 */
	final public boolean isVisible() {
		return isAdded() && !isHidden() && mView != null && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE;
	}

	/**
	 * Return true if the fragment has been hidden. By default fragments are
	 * shown. You can find out about changes to this state with
	 * {@link #onHiddenChanged}. Note that the hidden state is orthogonal to
	 * other states -- that is, to be visible to the user, a fragment must be
	 * both started and not hidden.
	 */
	final public boolean isHidden() {
		return mHidden;
	}

	/**
	 * Called when the hidden state (as returned by {@link #isHidden()} of the
	 * fragment has changed. Fragments start out not hidden; this will be called
	 * whenever the fragment changes state from that.
	 * 
	 * @param hidden
	 *            True if the fragment is now hidden, false if it is not
	 *            visible.
	 */
	public void onHiddenChanged(boolean hidden) {
	}

	/**
	 * Control whether a fragment instance is retained across Activity
	 * re-creation (such as from a configuration change). This can only be used
	 * with fragments not in the back stack. If set, the fragment lifecycle will
	 * be slightly different when an activity is recreated:
	 * <ul>
	 * <li> {@link #onDestroy()} will not be called (but {@link #onDetach()}
	 * still will be, because the fragment is being detached from its current
	 * activity).
	 * <li> {@link #onCreate(Bundle)} will not be called since the fragment is
	 * not being re-created.
	 * <li> {@link #onAttach(Activity)} and {@link #onActivityCreated(Bundle)}
	 * <b>will</b> still be called.
	 * </ul>
	 */
	public void setRetainInstance(boolean retain) {
		mRetainInstance = retain;
	}

	final public boolean getRetainInstance() {
		return mRetainInstance;
	}

	/**
	 * Report that this fragment would like to participate in populating the
	 * options menu by receiving a call to {@link #onCreateOptionsMenu} and
	 * related methods.
	 * 
	 * @param hasMenu
	 *            If true, the fragment has menu items to contribute.
	 */
	public void setHasOptionsMenu(boolean hasMenu) {
		if (mHasMenu != hasMenu) {
			mHasMenu = hasMenu;
			if (isAdded() && !isHidden()) {
				mActivity.invalidateOptionsMenu();
			}
		}
	}

	/**
	 * Set a hint for whether this fragment's menu should be visible. This is
	 * useful if you know that a fragment has been placed in your view hierarchy
	 * so that the user can not currently seen it, so any menu items it has
	 * should also not be shown.
	 * 
	 * @param menuVisible
	 *            The default is true, meaning the fragment's menu will be shown
	 *            as usual. If false, the user will not see the menu.
	 */
	public void setMenuVisibility(boolean menuVisible) {
		if (mMenuVisible != menuVisible) {
			mMenuVisible = menuVisible;
			if (mHasMenu && isAdded() && !isHidden()) {
				mActivity.invalidateOptionsMenu();
			}
		}
	}

	/**
	 * Set a hint to the system about whether this fragment's UI is currently
	 * visible to the user. This hint defaults to true and is persistent across
	 * fragment instance state save and restore.
	 * 
	 * <p>
	 * An app may set this to false to indicate that the fragment's UI is
	 * scrolled out of visibility or is otherwise not directly visible to the
	 * user. This may be used by the system to prioritize operations such as
	 * fragment lifecycle updates or loader ordering behavior.
	 * </p>
	 * 
	 * @param isVisibleToUser
	 *            true if this fragment's UI is currently visible to the user
	 *            (default), false if it is not.
	 */
	public void setUserVisibleHint(boolean isVisibleToUser) {
		if (!mUserVisibleHint && isVisibleToUser && mState < STARTED) {
			mFragmentManager.performPendingDeferredStart(this);
		}
		mUserVisibleHint = isVisibleToUser;
		mDeferStart = !isVisibleToUser;
	}

	/**
	 * @return The current value of the user-visible hint on this fragment.
	 * @see #setUserVisibleHint(boolean)
	 */
	public boolean getUserVisibleHint() {
		return mUserVisibleHint;
	}

	/**
	 * Return the LoaderManager for this fragment, creating it if needed.
	 */
	public LoaderManager getLoaderManager() {
		if (mLoaderManager != null) {
			return mLoaderManager;
		}
		if (mActivity == null) {
			throw new IllegalStateException("Fragment " + this + " not attached to Activity");
		}
		mCheckedForLoaderManager = true;
		mLoaderManager = mActivity.getInternalCallbacks().getLoaderManager(mIndex, mLoadersStarted, true);
		return mLoaderManager;
	}

	/**
	 * Call {@link Activity#startActivity(Intent)} on the fragment's containing
	 * Activity.
	 */
	public void startActivity(Intent intent) {
		if (mActivity == null) {
			throw new IllegalStateException("Fragment " + this + " not attached to Activity");
		}
		mActivity.startActivityFromFragment(this, intent, -1);
	}

	/**
	 * Call {@link Activity#startActivityForResult(Intent, int)} on the
	 * fragment's containing Activity.
	 */
	public void startActivityForResult(Intent intent, int requestCode) {
		if (mActivity == null) {
			throw new IllegalStateException("Fragment " + this + " not attached to Activity");
		}
		mActivity.startActivityFromFragment(this, intent, requestCode);
	}

	/**
	 * Receive the result from a previous call to
	 * {@link #startActivityForResult(Intent, int)}. This follows the related
	 * Activity API as described there in
	 * {@link Activity#onActivityResult(int, int, Intent)}.
	 * 
	 * @param requestCode
	 *            The integer request code originally supplied to
	 *            startActivityForResult(), allowing you to identify who this
	 *            result came from.
	 * @param resultCode
	 *            The integer result code returned by the child activity through
	 *            its setResult().
	 * @param data
	 *            An Intent, which can return result data to the caller (various
	 *            data can be attached to Intent "extras").
	 */
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
	}

	/**
	 * @hide Hack so that DialogFragment can make its Dialog before creating its
	 *       views, and the view construction can use the dialog's context for
	 *       inflation. Maybe this should become a public API. Note sure.
	 */
	public LayoutInflater getLayoutInflater(Bundle savedInstanceState) {
		return mActivity.getLayoutInflater();
	}

	/**
	 * Called when a fragment is being created as part of a view layout
	 * inflation, typically from setting the content view of an activity. This
	 * may be called immediately after the fragment is created from a <fragment>
	 * tag in a layout file. Note this is <em>before</em> the fragment's
	 * {@link #onAttach(Activity)} has been called; all you should do here is
	 * parse the attributes and save them away.
	 * 
	 * <p>
	 * This is called every time the fragment is inflated, even if it is being
	 * inflated into a new instance with saved state. It typically makes sense
	 * to re-parse the parameters each time, to allow them to change with
	 * different configurations.
	 * </p>
	 * 
	 * <p>
	 * Here is a typical implementation of a fragment that can take parameters
	 * both through attributes supplied here as well from
	 * {@link #getArguments()}:
	 * </p>
	 * 
	 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/
	 * FragmentArguments.java fragment}
	 * 
	 * <p>
	 * Note that parsing the XML attributes uses a "styleable" resource. The
	 * declaration for the styleable used here is:
	 * </p>
	 * 
	 * {@sample development/samples/ApiDemos/res/values/attrs.xml
	 * fragment_arguments}
	 * 
	 * <p>
	 * The fragment can then be declared within its activity's content layout
	 * through a tag like this:
	 * </p>
	 * 
	 * {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml
	 * from_attributes}
	 * 
	 * <p>
	 * This fragment can also be created dynamically from arguments given at
	 * runtime in the arguments Bundle; here is an example of doing so at
	 * creation of the containing activity:
	 * </p>
	 * 
	 * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/
	 * FragmentArguments.java create}
	 * 
	 * @param activity
	 *            The Activity that is inflating this fragment.
	 * @param attrs
	 *            The attributes at the tag where the fragment is being created.
	 * @param savedInstanceState
	 *            If the fragment is being re-created from a previous saved
	 *            state, this is the state.
	 */
	public void onInflate(SupportActivity activity, AttributeSet attrs, Bundle savedInstanceState) {
		mCalled = true;
	}

	/**
	 * Called when a fragment is first attached to its activity.
	 * {@link #onCreate(Bundle)} will be called after this.
	 */
	public void onAttach(SupportActivity activity) {
		mCalled = true;
	}

	/**
	 * Called when a fragment loads an animation.
	 */
	public Animation onCreateAnimation(int transit, boolean enter, int nextAnim) {
		return null;
	}

	/**
	 * Called to do initial creation of a fragment. This is called after
	 * {@link #onAttach(Activity)} and before
	 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}.
	 * 
	 * <p>
	 * Note that this can be called while the fragment's activity is still in
	 * the process of being created. As such, you can not rely on things like
	 * the activity's content view hierarchy being initialized at this point. If
	 * you want to do work once the activity itself is created, see
	 * {@link #onActivityCreated(Bundle)}.
	 * 
	 * @param savedInstanceState
	 *            If the fragment is being re-created from a previous saved
	 *            state, this is the state.
	 */
	public void onCreate(Bundle savedInstanceState) {
		mCalled = true;
	}

	/**
	 * Called to have the fragment instantiate its user interface view. This is
	 * optional, and non-graphical fragments can return null (which is the
	 * default implementation). This will be called between
	 * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}.
	 * 
	 * <p>
	 * If you return a View from here, you will later be called in
	 * {@link #onDestroyView} when the view is being released.
	 * 
	 * @param inflater
	 *            The LayoutInflater object that can be used to inflate any
	 *            views in the fragment,
	 * @param container
	 *            If non-null, this is the parent view that the fragment's UI
	 *            should be attached to. The fragment should not add the view
	 *            itself, but this can be used to generate the LayoutParams of
	 *            the view.
	 * @param savedInstanceState
	 *            If non-null, this fragment is being re-constructed from a
	 *            previous saved state as given here.
	 * 
	 * @return Return the View for the fragment's UI, or null.
	 */
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		return null;
	}

	/**
	 * Called immediately after
	 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} has returned,
	 * but before any saved state has been restored in to the view. This gives
	 * subclasses a chance to initialize themselves once they know their view
	 * hierarchy has been completely created. The fragment's view hierarchy is
	 * not however attached to its parent at this point.
	 * 
	 * @param view
	 *            The View returned by
	 *            {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}.
	 * @param savedInstanceState
	 *            If non-null, this fragment is being re-constructed from a
	 *            previous saved state as given here.
	 */
	public void onViewCreated(View view, Bundle savedInstanceState) {
	}

	/**
	 * Get the root view for the fragment's layout (the one returned by
	 * {@link #onCreateView}), if provided.
	 * 
	 * @return The fragment's root view, or null if it has no layout.
	 */
	public View getView() {
		return mView;
	}

	/**
	 * Called when the fragment's activity has been created and this fragment's
	 * view hierarchy instantiated. It can be used to do final initialization
	 * once these pieces are in place, such as retrieving views or restoring
	 * state. It is also useful for fragments that use
	 * {@link #setRetainInstance(boolean)} to retain their instance, as this
	 * callback tells the fragment when it is fully associated with the new
	 * activity instance. This is called after {@link #onCreateView} and before
	 * {@link #onStart()}.
	 * 
	 * @param savedInstanceState
	 *            If the fragment is being re-created from a previous saved
	 *            state, this is the state.
	 */
	public void onActivityCreated(Bundle savedInstanceState) {
		mCalled = true;
	}

	/**
	 * Called when the Fragment is visible to the user. This is generally tied
	 * to {@link Activity#onStart() Activity.onStart} of the containing
	 * Activity's lifecycle.
	 */
	public void onStart() {
		mCalled = true;

		if (!mLoadersStarted) {
			mLoadersStarted = true;
			if (!mCheckedForLoaderManager) {
				mCheckedForLoaderManager = true;
				mLoaderManager = mActivity.getInternalCallbacks().getLoaderManager(mIndex, mLoadersStarted, false);
			}
			if (mLoaderManager != null) {
				mLoaderManager.doStart();
			}
		}
	}

	/**
	 * Called when the fragment is visible to the user and actively running.
	 * This is generally tied to {@link Activity#onResume() Activity.onResume}
	 * of the containing Activity's lifecycle.
	 */
	public void onResume() {
		mCalled = true;
	}

	/**
	 * Called to ask the fragment to save its current dynamic state, so it can
	 * later be reconstructed in a new instance of its process is restarted. If
	 * a new instance of the fragment later needs to be created, the data you
	 * place in the Bundle here will be available in the Bundle given to
	 * {@link #onCreate(Bundle)},
	 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and
	 * {@link #onActivityCreated(Bundle)}.
	 * 
	 * <p>
	 * This corresponds to {@link Activity#onSaveInstanceState(Bundle)
	 * Activity.onSaveInstanceState(Bundle)} and most of the discussion there
	 * applies here as well. Note however: <em>this method may be called
	 * at any time before {@link #onDestroy()}</em>. There are many situations
	 * where a fragment may be mostly torn down (such as when placed on the back
	 * stack with no UI showing), but its state will not be saved until its
	 * owning activity actually needs to save its state.
	 * 
	 * @param outState
	 *            Bundle in which to place your saved state.
	 */
	public void onSaveInstanceState(Bundle outState) {
	}

	public void onConfigurationChanged(Configuration newConfig) {
		mCalled = true;
	}

	/**
	 * Called when the Fragment is no longer resumed. This is generally tied to
	 * {@link Activity#onPause() Activity.onPause} of the containing Activity's
	 * lifecycle.
	 */
	public void onPause() {
		mCalled = true;
	}

	/**
	 * Called when the Fragment is no longer started. This is generally tied to
	 * {@link Activity#onStop() Activity.onStop} of the containing Activity's
	 * lifecycle.
	 */
	public void onStop() {
		mCalled = true;
	}

	public void onLowMemory() {
		mCalled = true;
	}

	/**
	 * Called when the view previously created by {@link #onCreateView} has been
	 * detached from the fragment. The next time the fragment needs to be
	 * displayed, a new view will be created. This is called after
	 * {@link #onStop()} and before {@link #onDestroy()}. It is called
	 * <em>regardless</em> of whether {@link #onCreateView} returned a non-null
	 * view. Internally it is called after the view's state has been saved but
	 * before it has been removed from its parent.
	 */
	public void onDestroyView() {
		mCalled = true;
	}

	/**
	 * Called when the fragment is no longer in use. This is called after
	 * {@link #onStop()} and before {@link #onDetach()}.
	 */
	public void onDestroy() {
		mCalled = true;
		// Log.v("foo", "onDestroy: mCheckedForLoaderManager=" +
		// mCheckedForLoaderManager
		// + " mLoaderManager=" + mLoaderManager);
		if (!mCheckedForLoaderManager) {
			mCheckedForLoaderManager = true;
			mLoaderManager = mActivity.getInternalCallbacks().getLoaderManager(mIndex, mLoadersStarted, false);
		}
		if (mLoaderManager != null) {
			mLoaderManager.doDestroy();
		}
	}

	/**
	 * Called by the fragment manager once this fragment has been removed, so
	 * that we don't have any left-over state if the application decides to
	 * re-use the instance. This only clears state that the framework internally
	 * manages, not things the application sets.
	 */
	void initState() {
		mIndex = -1;
		mWho = null;
		mAdded = false;
		mRemoving = false;
		mResumed = false;
		mFromLayout = false;
		mInLayout = false;
		mRestored = false;
		mBackStackNesting = 0;
		mFragmentManager = null;
		mActivity = null;
		mFragmentId = 0;
		mContainerId = 0;
		mTag = null;
		mHidden = false;
		mDetached = false;
		mRetaining = false;
		mLoaderManager = null;
		mLoadersStarted = false;
		mCheckedForLoaderManager = false;
	}

	/**
	 * Called when the fragment is no longer attached to its activity. This is
	 * called after {@link #onDestroy()}.
	 */
	public void onDetach() {
		mCalled = true;
	}

	/**
	 * Initialize the contents of the Activity's standard options menu. You
	 * should place your menu items in to <var>menu</var>. For this method to be
	 * called, you must have first called {@link #setHasOptionsMenu}. See
	 * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu}
	 * for more information.
	 * 
	 * @param menu
	 *            The options menu in which you place your items.
	 * 
	 * @see #setHasOptionsMenu
	 * @see #onPrepareOptionsMenu
	 * @see #onOptionsItemSelected
	 */
	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
	}

	/**
	 * Prepare the Screen's standard options menu to be displayed. This is
	 * called right before the menu is shown, every time it is shown. You can
	 * use this method to efficiently enable/disable items or otherwise
	 * dynamically modify the contents. See
	 * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu}
	 * for more information.
	 * 
	 * @param menu
	 *            The options menu as last shown or first initialized by
	 *            onCreateOptionsMenu().
	 * 
	 * @see #setHasOptionsMenu
	 * @see #onCreateOptionsMenu
	 */
	public void onPrepareOptionsMenu(Menu menu) {
	}

	/**
	 * Called when this fragment's option menu items are no longer being
	 * included in the overall options menu. Receiving this call means that the
	 * menu needed to be rebuilt, but this fragment's items were not included in
	 * the newly built menu (its
	 * {@link #onCreateOptionsMenu(Menu, MenuInflater)} was not called).
	 */
	public void onDestroyOptionsMenu() {
	}

	/**
	 * This hook is called whenever an item in your options menu is selected.
	 * The default implementation simply returns false to have the normal
	 * processing happen (calling the item's Runnable or sending a message to
	 * its Handler as appropriate). You can use this method for any items for
	 * which you would like to do processing without those other facilities.
	 * 
	 * <p>
	 * Derived classes should call through to the base class for it to perform
	 * the default menu handling.
	 * 
	 * @param item
	 *            The menu item that was selected.
	 * 
	 * @return boolean Return false to allow normal menu processing to proceed,
	 *         true to consume it here.
	 * 
	 * @see #onCreateOptionsMenu
	 */
	public boolean onOptionsItemSelected(MenuItem item) {
		return false;
	}

	/**
	 * This hook is called whenever the options menu is being closed (either by
	 * the user canceling the menu with the back/menu button, or when an item is
	 * selected).
	 * 
	 * @param menu
	 *            The options menu as last shown or first initialized by
	 *            onCreateOptionsMenu().
	 */
	public void onOptionsMenuClosed(Menu menu) {
	}

	/**
	 * Called when a context menu for the {@code view} is about to be shown.
	 * Unlike {@link #onCreateOptionsMenu}, this will be called every time the
	 * context menu is about to be shown and should be populated for the view
	 * (or item inside the view for {@link AdapterView} subclasses, this can be
	 * found in the {@code menuInfo})).
	 * <p>
	 * Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an
	 * item has been selected.
	 * <p>
	 * The default implementation calls up to
	 * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though
	 * you can not call this implementation if you don't want that behavior.
	 * <p>
	 * It is not safe to hold onto the context menu after this method returns.
	 * {@inheritDoc}
	 */
	public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
		getActivity().onCreateContextMenu(menu, v, menuInfo);
	}

	/**
	 * Registers a context menu to be shown for the given view (multiple views
	 * can show the context menu). This method will set the
	 * {@link OnCreateContextMenuListener} on the view to this fragment, so
	 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be
	 * called when it is time to show the context menu.
	 * 
	 * @see #unregisterForContextMenu(View)
	 * @param view
	 *            The view that should show a context menu.
	 */
	public void registerForContextMenu(View view) {
		view.setOnCreateContextMenuListener(this);
	}

	/**
	 * Prevents a context menu to be shown for the given view. This method will
	 * remove the {@link OnCreateContextMenuListener} on the view.
	 * 
	 * @see #registerForContextMenu(View)
	 * @param view
	 *            The view that should stop showing a context menu.
	 */
	public void unregisterForContextMenu(View view) {
		view.setOnCreateContextMenuListener(null);
	}

	/**
	 * This hook is called whenever an item in a context menu is selected. The
	 * default implementation simply returns false to have the normal processing
	 * happen (calling the item's Runnable or sending a message to its Handler
	 * as appropriate). You can use this method for any items for which you
	 * would like to do processing without those other facilities.
	 * <p>
	 * Use {@link MenuItem#getMenuInfo()} to get extra information set by the
	 * View that added this menu item.
	 * <p>
	 * Derived classes should call through to the base class for it to perform
	 * the default menu handling.
	 * 
	 * @param item
	 *            The context menu item that was selected.
	 * @return boolean Return false to allow normal context menu processing to
	 *         proceed, true to consume it here.
	 */
	public boolean onContextItemSelected(MenuItem item) {
		return false;
	}

	/**
	 * Print the Fragments's state into the given stream.
	 * 
	 * @param prefix
	 *            Text to print at the front of each line.
	 * @param fd
	 *            The raw file descriptor that the dump is being sent to.
	 * @param writer
	 *            The PrintWriter to which you should dump your state. This will
	 *            be closed for you after you return.
	 * @param args
	 *            additional arguments to the dump request.
	 */
	public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
		writer.print(prefix);
		writer.print("mFragmentId=#");
		writer.print(Integer.toHexString(mFragmentId));
		writer.print(" mContainerId#=");
		writer.print(Integer.toHexString(mContainerId));
		writer.print(" mTag=");
		writer.println(mTag);
		writer.print(prefix);
		writer.print("mState=");
		writer.print(mState);
		writer.print(" mIndex=");
		writer.print(mIndex);
		writer.print(" mWho=");
		writer.print(mWho);
		writer.print(" mBackStackNesting=");
		writer.println(mBackStackNesting);
		writer.print(prefix);
		writer.print("mAdded=");
		writer.print(mAdded);
		writer.print(" mRemoving=");
		writer.print(mRemoving);
		writer.print(" mResumed=");
		writer.print(mResumed);
		writer.print(" mFromLayout=");
		writer.print(mFromLayout);
		writer.print(" mInLayout=");
		writer.println(mInLayout);
		writer.print(prefix);
		writer.print("mHidden=");
		writer.print(mHidden);
		writer.print(" mDetached=");
		writer.print(mDetached);
		writer.print(" mMenuVisible=");
		writer.print(mMenuVisible);
		writer.print(" mHasMenu=");
		writer.println(mHasMenu);
		writer.print(prefix);
		writer.print("mRetainInstance=");
		writer.print(mRetainInstance);
		writer.print(" mRetaining=");
		writer.print(mRetaining);
		writer.print(" mUserVisibleHint=");
		writer.println(mUserVisibleHint);
		if (mFragmentManager != null) {
			writer.print(prefix);
			writer.print("mFragmentManager=");
			writer.println(mFragmentManager);
		}
		if (mActivity != null) {
			writer.print(prefix);
			writer.print("mActivity=");
			writer.println(mActivity);
		}
		if (mArguments != null) {
			writer.print(prefix);
			writer.print("mArguments=");
			writer.println(mArguments);
		}
		if (mSavedFragmentState != null) {
			writer.print(prefix);
			writer.print("mSavedFragmentState=");
			writer.println(mSavedFragmentState);
		}
		if (mSavedViewState != null) {
			writer.print(prefix);
			writer.print("mSavedViewState=");
			writer.println(mSavedViewState);
		}
		if (mTarget != null) {
			writer.print(prefix);
			writer.print("mTarget=");
			writer.print(mTarget);
			writer.print(" mTargetRequestCode=");
			writer.println(mTargetRequestCode);
		}
		if (mNextAnim != 0) {
			writer.print(prefix);
			writer.print("mNextAnim=");
			writer.println(mNextAnim);
		}
		if (mContainer != null) {
			writer.print(prefix);
			writer.print("mContainer=");
			writer.println(mContainer);
		}
		if (mView != null) {
			writer.print(prefix);
			writer.print("mView=");
			writer.println(mView);
		}
		if (mInnerView != null) {
			writer.print(prefix);
			writer.print("mInnerView=");
			writer.println(mView);
		}
		if (mAnimatingAway != null) {
			writer.print(prefix);
			writer.print("mAnimatingAway=");
			writer.println(mAnimatingAway);
			writer.print(prefix);
			writer.print("mStateAfterAnimating=");
			writer.println(mStateAfterAnimating);
		}
		if (mLoaderManager != null) {
			writer.print(prefix);
			writer.println("Loader Manager:");
			mLoaderManager.dump(prefix + "  ", fd, writer, args);
		}
	}

	void performStart() {
		onStart();
		if (mLoaderManager != null) {
			mLoaderManager.doReportStart();
		}
	}

	void performStop() {
		onStop();
	}

	void performReallyStop() {
		if (mLoadersStarted) {
			mLoadersStarted = false;
			if (!mCheckedForLoaderManager) {
				mCheckedForLoaderManager = true;
				mLoaderManager = mActivity.getInternalCallbacks().getLoaderManager(mIndex, mLoadersStarted, false);
			}
			if (mLoaderManager != null) {
				if (!mActivity.getInternalCallbacks().getRetaining()) {
					mLoaderManager.doStop();
				} else {
					mLoaderManager.doRetain();
				}
			}
		}
	}

	void performDestroyView() {
		onDestroyView();
		if (mLoaderManager != null) {
			mLoaderManager.doReportNextStart();
		}
	}
}
